# Models of stars rotating near the critical limit - Astrophysics > Solar and Stellar Astrophysics

Models of stars rotating near the critical limit - Astrophysics > Solar and Stellar Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: When the surface angular velocity is above about 70% of the critical angularvelocity, many interesting features appear which may be tested byinterferometric observations, like significant deformation of stars, variationof the effective temperature with the latitude. Also polar winds becomeimportant and equatorial disks may appear. Near the critical limit, convectionis also favored in the outer layers. In the present paper, we emphasize theneed for a proper estimate of the critical velocity since this is the ratio ofthe actual velocity of the star to that critical velocity which determines theamplitude of the above effects. We recall the existence of two criticalvelocities. The first one, also called the classical critical velocity is theone to consider when the star has an Eddington factor inferior to 0.639, whilethe second one is the one to be considered when the Eddington factor is above0.639. The features of the star at these two critical limits may be verydifferent.

Author: ** G. Meynet, C. Georgy, Y. Revaz, R. Walder, S. Ekstrom, A. Maeder**

Source: https://arxiv.org/